US PATENT SUBCLASS 279 / 2.17
.~.~ Axially compressible element expands radially

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279 /   HD   CHUCKS OR SOCKETS

2.01  DF  EXPANDING {6}
2.1  DF  .~ Axially moving actuator {4}
2.17.~.~ Axially compressible element expands radially

DEFINITION

Classification: 279/2.17

Axially compressible element expands radially:

(under subclass 2.1) A device wherein the means for making the connection is an elastomeric, generally cylindrical member which expands in diameter when shortened lengthwise.

SEE OR SEARCH THIS CLASS, SUBCLASS:

46.1+, for a socket with spring biased jaws.